CN109798078B - Coal bed gas horizontal well cave sand-buried well repairing process - Google Patents
Coal bed gas horizontal well cave sand-buried well repairing process Download PDFInfo
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Abstract
The invention provides a coal bed gas horizontal well cave sand burying well repairing process, which comprises the following steps: sequentially putting a protective sleeve, a bailing pen point, a tail pipe, a bailing pump and an oil pipe into an original well, starting the bailing pump to clean fracturing sand in the original well, and putting a first drift size gauge to the top of a cave; taking out the first drift size gauge, putting in the liner tube, the release and the oil tube, recording the initial position of the liner tube, taking out the oil tube, putting in the tricone bit, the screw drill and the oil tube, and putting the tricone bit down to the bottom of the initial position of the slotted liner tube; performing drilling operation by controlling a tricone bit and a screw drill until the tricone bit drills to the bottom of the artificial well; and (5) running a second drifting gauge to the bottom of the artificial well, and running a sand washing pen point and an oil pipe to the bottom of the artificial well for washing. According to the invention, through the drilling of the screw rod in the slotted liner tube for assisting drilling and well repairing operation, the integrity of the shaft is ensured, and the phenomenon of coal bed collapse in the process of sand burying and well repairing is effectively prevented.
Description
Technical Field
The invention belongs to the technical field of coal bed gas well workover processes, and particularly relates to a coal bed gas horizontal well cave sand-buried workover process.
Background
The U-shaped horizontal well is a common coal bed gas well completion mode in China, and the principle of the U-shaped horizontal well is that a horizontal engineering well is communicated with a vertical well at a vertical well cave section, the horizontal engineering well is communicated with a coal bed cutting system to the greatest extent, and drainage and gas production in the vertical well are realized by utilizing the gravity effect. The method has the advantages of greatly increasing the pressure relief area of the coal bed, improving the discharge and hydrolysis absorption speed of the coal bed gas and improving the development benefit of the coal bed gas. The method has the disadvantages that the coal bed is cut and developed, the mechanical strength is low, the influence of horizontal well fracturing and cave drilling is caused, the coal bed at the cave section of the vertical well is broken seriously, the coal bed section is easy to collapse, coal blocks, gangue, cement blocks, coal slime and fracturing sand in a shaft block the pocket and the cave section of the vertical well, and finally the whole well cannot be drained and mined normally.
The existing sand burying well repairing technology of the coal bed gas is circulating sand washing and mechanical sand bailing, which can only solve the problem of common sand burying and cannot process a shaft with a coal bed collapsing continuously. The conventional sand bailing process is poor in effect, no footage is caused in bailing, the construction period is long, even if the conventional sand bailing process is simply processed, the cave can collapse again, the well repairing frequency is high, and the complex sand burying capable of effectively processing the cave section is not formed in China by a mature technology. In addition, the coal seam collapses and easily causes the instrument in the pit to be buried, leads to the accident in the pit, finally causes the whole well to scrap.
Disclosure of Invention
The embodiment of the invention aims to provide a coal bed gas horizontal well cave sand-buried well repairing process, and aims to solve the problems that a coal bed is easy to collapse and a vertical well cave is unstable in the existing sand-buried well repairing process.
The embodiment of the invention is realized in such a way that a process for repairing a coal bed gas horizontal well by cave sand burial comprises the following steps:
disassembling an original well mouth, taking out an original well inner pipe column, sequentially putting a protective sleeve, a bailing pen point, a tail pipe, a bailing pump and an oil pipe into the original well, and starting the bailing pump to clean fracturing sand in the original well until the fracturing sand reaches the top of a cave in the original well;
taking out the protective casing, the bailing pen point, the tail pipe, the bailing pump and the oil pipe, and putting a first drift size gauge to reach the top of the cave;
taking out the first drift size gauge, running a liner pipe, a release and an oil pipe, and recording the initial position of the liner pipe, wherein the liner pipe comprises a lead angle liner pipe and a plurality of slotted liner pipes;
taking out the oil pipe, putting the tricone bit, the screw drill and the oil pipe in, and putting the tricone bit down to the bottom of the initial position of the slotted liner pipe;
performing a drilling operation by controlling the tricone bit and the screw drill until the tricone bit drills to the bottom of the artificial well;
and taking out the tricone bit and the screw drill, putting a second drifting gauge drift to the artificial well bottom, and putting a sand washing pen point and an oil pipe to the artificial well bottom for washing so as to wash out the settled sand and the coal powder in the original well.
Above-mentioned coal bed gas horizontal well cave sand buries well workover technology, the bailing process is effectual, the bailing nib with the bailing of bailing pump is efficient, shields cave section coal seam through adopting the slot bushing pipe to through the supplementary well workover operation that creeps into of screw drill in the slot bushing pipe, and then ensured pit shaft integrality, improved whole operation speed by a wide margin, and the effectual emergence that prevents the sand buries the well workover in-process coal seam and collapses the phenomenon.
Further, the step of running the liner, the release and the tubing comprises:
controlling the liner tube to perform pipe lowering operation at a preset pipe lowering speed, and observing a weight indicator;
and when the overhang weight value of the weight indicator is 0, the releasing gadget is used for being put into the slotted liner pipe, the initial position of the slotted liner pipe is recorded, and the oil pipe is put into the slotted liner pipe.
Further, the step of performing a drilling operation by controlling the tricone bit and the screw drill includes:
controlling the tricone bit and the screw drill to drill 0.5 meter at each time at the cave section, lifting 9 meters after drilling 8 meters below the cave section, and continuously lowering to observe whether the blockage phenomenon exists;
if not, controlling the tricone bit and the screw drill to the bottom of the artificial well;
and if so, lifting the tricone bit and the screw drill above the cave, and then carrying out multiple reaming operations.
Furthermore, the steel grade of the liner pipe is N80, the slots are distributed with 20 slots/m, the radial distribution is divided into four groups, the size of the slots is 10cm by 8mm, the total running length of the liner pipe is larger than the distance from the top of the cave to the bottom of the artificial well, and connecting buckles used between the adjacent liner pipes are of a non-coupling buckle type.
Further, before the step of starting the bailing pump to clean the fracturing sand in the original well, the process further comprises:
judging whether the bailing pump meets preset working conditions or not;
if not, an alarm prompt is sent out.
Further, the condition parameter of the preset working condition is one or more of an electric quantity parameter, a voltage parameter and a torque parameter.
Furthermore, the top of the uppermost protective casing of the slotted liner is provided with a bell mouth, and the bell mouth is used for ensuring the smooth running of subsequent workover and drainage tools.
Further, the load of the second drift gauge is reduced by less than 20 to 30 KN.
Further, in the drilling operation by controlling the tricone bit and the screw drill, the weight on bit of the tricone bit and the screw drill is 3 to 5 KN.
Further, the first drift size gauge employed was a 152mmx1200mm chamfer drift size, and the second drift size gauge employed was a 116mm x 1.5m drift size.
Drawings
FIG. 1 is a flow chart of a process for repairing a horizontal coal bed methane well by a sand-buried cave according to a first embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating the effect of a coal bed methane horizontal well cave sand reclamation process provided by a first embodiment of the present invention;
FIG. 3 is a flow chart of a process for repairing a horizontal coalbed methane well by burying sand in a cave according to a second embodiment of the present invention;
FIG. 4 is a flow chart of a process for repairing a horizontal coalbed methane well by burying sand in a cave according to a third embodiment of the present invention;
the following detailed description will further illustrate the invention in conjunction with the above-described figures.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In order to explain the technical means of the present invention, the following description will be given by way of specific examples.
Example one
Referring to fig. 1 to 2, a first embodiment of the present invention provides a sand burying and workover process for a coal bed gas horizontal well cave, wherein 10 in fig. 2 is a vertical well bore of an original well, 11 is a bell mouth, 12 is a slotted liner, 13 is a screw drill, 14 is a cave top, 15 is a cave bottom, 16 is an artificial bottom, 17 is fracturing sand and coal briquette, 18 is a horizontal well bore, and 19 is a coal bed, the sand burying and workover process for the coal bed gas horizontal well cave comprises the steps of:
step S10, disassembling an original wellhead, taking out an original well pipe column, and sequentially putting a protective sleeve, a bailing pen point, a tail pipe, a bailing pump and an oil pipe into the original well;
the size of the bailing pen tip is 114mmx6m, the size of the tail pipe is 89mm, the size of the bailing pump is 90mm, the size of the oil pipe is 73mm, and the number of the tail pipes is 4-5;
step S20, starting the bailing pump to clean the fracturing sand in the original well until the top of the cave in the original well is reached;
the control signal adopted by the bailing pump is an electric signal, a voice signal, a key signal or a wireless signal, the control signal is used for correspondingly controlling the switching control of the working state of the bailing pump, and the cleaning effect of the fracturing sand in the original well is effectively guaranteed through the design of the bailing pump;
step S30, taking out the protective sleeve, the bailing pen point, the tail pipe, the bailing pump and the oil pipe, and putting a first drift size gauge to the top of the cave;
the first drift size gauge adopts a 152mmx1200mm chamfer drift size gauge;
step S40, taking out the first drift size gauge, setting a liner, a release and an oil pipe, and recording the initial position of the liner;
the liner pipe comprises a lead angle liner pipe and a plurality of slotted liner pipes, the steel grade of the liner pipe is N80, the slots are distributed at 20 slots/m and are uniformly distributed in four groups in the radial direction, the size of the slots is 10cm by 8mm, the total running length of the liner pipe is greater than the distance from the top of the cave to the bottom of the artificial well, and connecting buckles used between the adjacent liner pipes are of a non-coupling buckle type;
step S50, taking out an oil pipe, putting in a tricone bit, a screw drill and the oil pipe, and putting the tricone bit deep to the bottom of the initial position of the slotted liner pipe;
wherein the bit weight of the tricone bit and the screw drill is 3 to 5KN in the drilling operation by controlling the tricone bit and the screw drill;
step S60, drilling by controlling the tricone bit and the screw drill until the tricone bit drills to the bottom of the artificial well;
step S70, taking out the tricone bit and the screw drill, putting a second drift size drift well to the artificial well bottom, and putting a sand washing pen point and an oil pipe to the artificial well bottom for washing so as to wash out the settled sand and the coal powder in the original well;
wherein the second drift size is a 116mm x 1.5m drift size;
in this embodiment, the bailing process is effectual, the bailing nib with the bailing of bailing pump is efficient, and this process design thought is advanced, and on-the-spot maneuverability is strong, and construction cycle is short, and the engineering cost is low, can fundamentally solve the common cave problem of collapsing of coal bed gas horizontal well, shields cave section coal seam through adopting the slot liner pipe to bore supplementary well workover operation of creeping into through the screw rod in the slot liner pipe, and then has ensured pit shaft integrality, has improved whole operating speed by a wide margin, and has effectually prevented the emergence of the phenomenon of collapsing of coal bed among the sand buries well workover process.
Example two
Referring to fig. 3, a flow chart of a coal bed methane horizontal well cave sand-buried well repairing process according to a second embodiment of the present invention includes the steps of:
step S11, disassembling an original wellhead, taking out an original well pipe column, and sequentially putting a protective sleeve, a bailing pen point, a tail pipe, a bailing pump and an oil pipe into the original well;
the size of the bailing pen tip is 114mmx6m, the size of the tail pipe is 89mm, the size of the bailing pump is 90mm, the size of the oil pipe is 73mm, and the number of the tail pipes is 4-5;
step S21, starting the bailing pump to clean the fracturing sand in the original well until the top of the cave in the original well is reached;
the control signal adopted by the bailing pump is an electric signal, a voice signal, a key signal or a wireless signal, the control signal is used for correspondingly controlling the switching control of the working state of the bailing pump, and the cleaning effect of the fracturing sand in the original well is effectively guaranteed through the design of the bailing pump;
step S31, taking out the protective sleeve, the bailing pen point, the tail pipe, the bailing pump and the oil pipe, and putting a first drift size gauge to the top of the cave;
the first drift size gauge adopts a 152mmx1200mm chamfer drift size gauge;
step S41, taking out the first drift size gauge, controlling the liner pipe to perform pipe descending operation at a preset pipe descending speed, and observing a weight indicator;
the preset pipe descending speed is 30 pipes/hour, and particularly, the descending speed is controlled when the liner pipe enters the well, so that sand holes are effectively prevented from being formed in the drilling operation process;
step S51, when the overhang weight value of the weight indicator is 0, the back-off release is adopted to drop the weight indicator into the slotted liner, the initial position of the slotted liner is recorded, and an oil pipe is dropped;
the liner pipe comprises a lead angle liner pipe and a plurality of slotted liner pipes, the steel grade of the liner pipe is N80, the slots are distributed at 20 slots/m and are uniformly distributed in four groups in the radial direction, the size of the slots is 10cm by 8mm, the total running-in length of the liner pipe is greater than the distance from the top of the cave to the bottom of the artificial well, connecting buckles adopted between the adjacent liner pipes are of a non-coupling buckle type, preferably, the top of the uppermost protective sleeve pipe of the slotted liner pipes is provided with a horn mouth, and the horn mouth is used for ensuring the smooth running-in of subsequent well repairing and drainage and production tools;
step S61, taking out an oil pipe, putting in a tricone bit, a screw drill and the oil pipe, and putting the tricone bit deep to the bottom of the initial position of the slotted liner pipe;
wherein the bit weight of the tricone bit and the screw drill is 3 to 5KN in the drilling operation by controlling the tricone bit and the screw drill;
step S71, controlling the tricone bit and the screw drill to drill 0.5 meter at each time at the cave section, and lifting 9 meters after drilling 8 meters below the cave section;
through the design of repeated lifting actions for many times, sand holes are effectively prevented from being formed in the drilling operation process, and the slotted liner tube is favorable for descending under the action of gravity;
step S81, continuously lowering and observing whether the tricone bit and the screw drill have jamming phenomena;
the current drilling state is effectively judged by judging whether the tricone bit and the screw drill have the jamming phenomenon or not, and whether the tricone bit and the screw drill are in the fault phenomenon or not is judged in time;
when the judgment result of the step S81 is yes, step S91 is performed;
step S91, lifting the tricone bit and the screw drill above a cave, and then carrying out a plurality of reaming operations;
the accuracy of subsequent drilling operation is effectively improved by designing the multi-time reaming operation;
when the judgment result of the step S81 is no, step S101 is executed;
s101, controlling the tricone bit and the screw drill to the bottom of the artificial well;
step S111, taking out the tricone bit and the screw drill, putting a second drift size drift to the artificial well bottom, and putting a sand washing pen point and an oil pipe to the artificial well bottom for washing so as to wash out the settled sand and the coal powder in the original well;
wherein the second drift size is 116mm x 1.5m drift size, and the load of the second drift size is reduced by less than 20-30 KN;
in the embodiment, the bailing process is good in effect, the bailing pen point and the bailing pump are high in bailing efficiency, the process is advanced in design thought, strong in field operability, short in construction period and low in engineering cost, the common cave collapse problem of the coal bed gas horizontal well can be fundamentally solved, the cave section coal bed is shielded by adopting the slotted liner pipe, the screw drill is used for assisting in drilling and repairing the well in the slotted liner pipe, the integrity of a shaft is further ensured, the overall operation speed is greatly improved, the coal bed collapse phenomenon in the sand burying and repairing process is effectively prevented, the downward entering speed is controlled during the drilling of the screw, the lifting action is repeatedly performed for multiple times, sand holes are effectively prevented from being formed in the drilling operation process, and meanwhile, the slotted liner pipe is favorable for descending under the action of gravity.
EXAMPLE III
Referring to fig. 4, a flow chart of a coal bed methane horizontal well cave sand-buried well repairing process according to a third embodiment of the present invention includes the steps of:
step S12, disassembling an original wellhead, taking out an original well pipe column, and sequentially putting a protective sleeve, a bailing pen point, a tail pipe, a bailing pump and an oil pipe into the original well;
the size of the bailing pen tip is 114mmx6m, the size of the tail pipe is 89mm, the size of the bailing pump is 90mm, the size of the oil pipe is 73mm, and the number of the tail pipes is 4-5;
step S22, judging whether the bailing pump meets the preset working condition;
the method comprises the following steps that a condition parameter of a preset working condition is one or a plurality of combinations of an electric quantity parameter, a voltage parameter and a torque parameter, specifically, in the step, the judgment of the preset working condition is carried out on the bailing pump so as to judge whether the bailing pump can carry out bailing operation normally, and further, the process efficiency of the coal bed gas horizontal well cave sand-burying well repairing process is effectively improved;
when the judgment result of the step S22 is no, step S32 is performed;
the alarm prompt can adopt a sound-light alarm, a voice alarm or a wireless signal alarm mode to prompt a user to detect or replace the bailing pump;
when the judgment result of the step S22 is yes, step S42 is performed;
step S42, starting the bailing pump to clean the fracturing sand in the original well until the top of the cave in the original well is reached;
the control signal adopted by the bailing pump is an electric signal, a voice signal, a key signal or a wireless signal, the control signal is used for correspondingly controlling the switching control of the working state of the bailing pump, and the cleaning effect of the fracturing sand in the original well is effectively guaranteed through the design of the bailing pump;
step S52, taking out the protective sleeve, the bailing pen point, the tail pipe, the bailing pump and the oil pipe, and putting a first drift size gauge to the top of the cave;
the first drift size gauge adopts a 152mmx1200mm chamfer drift size gauge;
step S62, taking out the first drift size gauge, controlling the liner pipe to perform pipe descending operation at a preset pipe descending speed, and observing a weight indicator;
the preset pipe descending speed is 30 pipes/hour, and particularly, the descending speed is controlled when the liner pipe enters the well, so that sand holes are effectively prevented from being formed in the drilling operation process;
step S72, when the overhang weight value of the weight indicator is 0, the back-off release is adopted to drop the weight indicator into the slotted liner, the initial position of the slotted liner is recorded, and an oil pipe is dropped;
the liner pipe comprises a lead angle liner pipe and a plurality of slotted liner pipes, the steel grade of the liner pipe is N80, the slots are distributed at 20 slots/m and are uniformly distributed in four groups in the radial direction, the size of the slots is 10cm by 8mm, the total running-in length of the liner pipe is greater than the distance from the top of the cave to the bottom of the artificial well, connecting buckles adopted between the adjacent liner pipes are of a non-coupling buckle type, preferably, the top of the uppermost protective sleeve pipe of the slotted liner pipes is provided with a horn mouth, and the horn mouth is used for ensuring the smooth running-in of subsequent well repairing and drainage and production tools;
step S82, taking out an oil pipe, putting in a tricone bit, a screw drill and the oil pipe, and putting the tricone bit deep to the bottom of the initial position of the slotted liner pipe;
step S92, controlling the tricone bit and the screw drill to drill 0.5 meter at each time at the cave section, and lifting 9 meters after drilling 8 meters below the cave section;
s102, continuously lowering and observing whether the tricone bit and the screw drill have jamming phenomena;
when the judgment result of the step S102 is yes, step S112 is executed;
step S112, lifting the tricone bit and the screw drill above a cave, and then carrying out a plurality of reaming operations;
when the judgment result of the step S102 is no, step S122 is executed;
step S122, controlling the tricone bit and the screw drill to the bottom of the artificial well;
step S132, taking out the tricone bit and the screw drill, putting a second drifting gauge drift to the bottom of the artificial well, and putting a sand washing pen point and an oil pipe to the bottom of the artificial well for washing so as to wash out the settled sand and the coal powder in the original well;
in this embodiment, the bailing process is effectual, the bailing nib with the bailing of bailing pump is efficient, and this process design thought is advanced, and on-the-spot maneuverability is strong, and construction cycle is short, and the engineering cost is low, can fundamentally solve the common cave problem of collapsing of coal bed gas horizontal well, shields cave section coal seam through adopting the slot liner pipe to bore supplementary well workover operation of creeping into through the screw rod in the slot liner pipe, and then has ensured pit shaft integrality, has improved whole operating speed by a wide margin, and has effectually prevented the emergence of the phenomenon of collapsing of coal bed among the sand buries well workover process.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. The coal bed gas horizontal well cave sand burying well repairing process is characterized by comprising the following steps of:
disassembling an original well mouth, taking out an original well inner pipe column, sequentially putting a protective sleeve, a bailing pen point, a tail pipe, a bailing pump and an oil pipe into the original well, and starting the bailing pump to clean fracturing sand in the original well until the fracturing sand reaches the top of a cave in the original well;
taking out the protective casing, the bailing pen point, the tail pipe, the bailing pump and the oil pipe, and putting a first drift size gauge to reach the top of the cave;
taking out the first drift size gauge, running a liner pipe, a release and an oil pipe, and recording the initial position of the liner pipe, wherein the liner pipe comprises a lead angle liner pipe and a plurality of slotted liner pipes;
taking out the oil pipe, putting the tricone bit, the screw drill and the oil pipe in, and putting the tricone bit down to the bottom of the initial position of the slotted liner pipe;
performing a drilling operation by controlling the tricone bit and the screw drill until the tricone bit drills to the bottom of the artificial well;
taking out the tricone bit and the screw drill, putting a second drift size drift to the artificial well bottom, and putting a sand washing pen point and an oil pipe to the artificial well bottom for washing so as to wash out the sand setting and the coal dust in the original well;
the steps of running the liner tube, releasing and oil pipe comprise:
controlling the liner tube to perform pipe lowering operation at a preset pipe lowering speed, and observing a weight indicator;
when the overhang weight value of the weight indicator is 0, then the back-off release is adopted to be put into the slotted liner tube, the initial position of the slotted liner tube is recorded, and an oil pipe is put into the slotted liner tube;
the step of performing a drilling operation by controlling the tricone bit and the screw drill includes:
controlling the tricone bit and the screw drill to drill 0.5 meter at each time at the cave section, lifting 9 meters after drilling 8 meters below the cave section, and continuously lowering to observe whether the blockage phenomenon exists;
if not, controlling the tricone bit and the screw drill to the bottom of the artificial well;
and if so, lifting the tricone bit and the screw drill above the cave, and then carrying out multiple reaming operations.
2. The process of claim 1, wherein the liner has a steel grade of N80, the slots are distributed at 20 slots/m and evenly distributed in four radial groups, the slots are 10cm by 8mm, the total length of the liner run-in is greater than the distance from the top of the hole to the bottom of the artificial well, and the connecting buckles used between the adjacent liners are of a non-coupling buckle type.
3. The process of claim 1, wherein before the step of activating the bailing pump to clean the frac sand in the parent well, the process further comprises:
judging whether the bailing pump meets preset working conditions or not;
if not, an alarm prompt is sent out.
4. The process of claim 3, wherein the condition parameter of the preset working condition is one or more of an electric quantity parameter, a voltage parameter and a torque parameter.
5. The process for repairing a coal bed gas horizontal well and a cave sand burying well according to claim 1, wherein a bell mouth is arranged at the top of the uppermost protecting sleeve of the slotted liner, and the bell mouth is used for ensuring the smooth descending of a follow-up well repairing and extracting tool.
6. The process of claim 1, wherein the load of the second drift gauge is reduced by less than 20 to 30 KN.
7. The process of claim 1, wherein the tricone bit and the screw drill have a weight on bit of 3 to 5KN in the drilling operation by controlling the tricone bit and the screw drill.
8. The process of claim 1, wherein the first drift gauge is a 152mm x1200mm chamfer drift gauge, and the second drift gauge is a 116mm x 1.5m drift gauge.
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